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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
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[[ has fewer surprises and is generally safer to use. But it is not portable - POSIX doesn't specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do
[[ -e $b ]]
to test whether a ...
CSS selector for first element with class
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This is one of the most well-known examples of authors misunderstanding how :first-child works. Introduced in CSS2, the :first-child pseudo-class represents the very first child of its parent. That's it. There's a very common misconception that it picks up whichever child element is the fi...
What is the difference between :first-child and :first-of-type?
I can't tell the difference between element:first-child and element:first-of-type
3 Answers
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Transport endpoint is not connected
...ving me this Transport endpoint is not connected error on my mount point and the only thing that seems to fix it is rebooting.
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Update multiple rows in same query using PostgreSQL
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You can also use update ... from syntax and use a mapping table. If you want to update more than one column, it's much more generalizable:
update test as t set
column_a = c.column_a
from (values
('123', 1),
('345', 2)
) as c(column_b, column_a)
wher...
How to handle click event in Button Column in Datagridview?
...play data. I have added a button column in that. I want to know how can I handle click event on that button in DataGridView.
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Sticky and NON-Sticky sessions
I want to know the difference between sticky- and non-sticky sessions. What I understood after reading from internet:
2 Ans...
How does one use rescue in Ruby without the begin and end block
I know of the standard technique of having a begin rescue end
5 Answers
5
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Printing HashMap In Java
...y returns a set of keys from your hashmap, you should iterate this key set and the get the value from the hashmap using these keys.
In your example, the type of the hashmap's key is TypeKey, but you specified TypeValue in your generic for-loop, so it cannot be compiled. You should change it to :
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How do you round to 1 decimal place in Javascript?
...railing zeros
// So, just make sure it is the last step before output,
// and use a number format during calculations!
EDIT: Add round with precision function...
Using this principle, for reference, here is a handy little round function that takes precision...
function round(value, precision) {...